Abstract
Objective: The present investigation was undertaken to determine whether p34cdc2, a cell-cycle regulatory kinase, is involved in the manifestation of the altered proliferation evident in fibroblasts isolated from spontaneously hypertensive rats (SHR). Design: Experiments were performed on quiescent aortic adventitial fibroblasts stimulated to re-enter the cell cycle in order to examine the timing of cell cycle-related events. Methods: The cell-cycle phase was determined by flow cytometry and was related to the cellular content and kinase activity of p34cdc2. Results: SHR fibroblasts displayed a heightened basal level of p34cdc2 at quiescence relative to Wistar-Kyoto (WKY) rat cells. Both SHR and WKY fibroblasts showed a cell cycle-dependent increase in p34cdc2 content, beginning in S phase. However, the SHR adventitial fibroblasts exited Go—G-] several hours earlier than the WKY fibroblasts as indicated by the time of initiation of DNA synthesis and increase in activity of p34cdc2. Conclusions:SHR aortic adventitial fibroblasts appear to have a heightened proliferative capacity relative to WKY fibroblasts, which is evident in a quicker exit fromCo and faster transition to DNA synthesis, followed by the earlier activation of p34cdc2.
Original language | English (US) |
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Pages (from-to) | 483-484 |
Number of pages | 2 |
Journal | Journal of hypertension |
Volume | 11 |
Issue number | 5 |
DOIs | |
State | Published - May 1993 |
Keywords
- Adventitial fibroblasts
- Cell cycle
- Hypertensive rat
- P34
- Proliferation
- Spontaneously
ASJC Scopus subject areas
- Internal Medicine
- Physiology
- Cardiology and Cardiovascular Medicine